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java编程求高手帮忙(如何java编程)

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java编程问题,请高手帮忙!!

小弟啊,认真学习啊,代码如下:看不懂问我

import java.io.*;

class Rectangle {

static double getArea(double length,double width) //求面积

{

return length*width;

}

static double getPerimeter(double length,double width) //求周长

{

return 2*(length+width);

}

public static void main(String args[]){

double length,width,area,perimeter;

try{

System.out.println("input length:");

BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

length = Double.parseDouble(br.readLine());

System.out.println("input width:");

width= Double.parseDouble(br.readLine());

area=getArea(length,width) ;

perimeter=getPerimeter(length,width);

System.out.println("Area="+String.valueOf(area));

System.out.println("Perimeter="+String.valueOf(perimeter));

}catch(Exception ex){System.out.println(ex.getMessage());};

}

}

求Java高手帮忙编程!

我也不太会,你看看这个程序行吗?

import java.lang.Math.*;

import java.awt.event.*;

import java.awt.*;

import javax.swing.*;

public class Sample extends JFrame implements ActionListener{

private JButton jb1 = new JButton("GetNumber");

private JButton jb2 = new JButton("Enter");

private JLabel jl = new JLabel();

private JTextField jf = new JTextField();

private JLabel jl1 = new JLabel();

private int num;

public Sample(){

jl.setSize(100,50);

jl.setLocation(50,0);

this.add(jl);

jf.setSize(50,20);

jf.setLocation(50,50);

this.add(jf);

jb1.setSize(100,30);

jb1.setLocation(30,100);

jb1.addActionListener(this);

this.add(jb1);

jb2.setSize(100,30);

jb2.setLocation(150,100);

jb2.addActionListener(this);

this.add(jb2);

this.add(jl1);

this.setTitle("猜数游戏");

this.setBounds(20,20,300,200);

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //实现关闭按钮

this.setResizable(false);

this.setVisible(true);

}

public void getNum(){

num=(int)(Math.random()*10000);

jl.setText("已经产生了数字:");

jl1.setText("");

}

public void test(){

String y;

int x;

y = jf.getText();

try{

x = Integer.parseInt(y);

if(x == num)

JOptionPane.showMessageDialog(this,"祝贺你,你猜对了!","",JOptionPane.INFORMATION_MESSAGE);

else if(xnum)

jl1.setText(" 数小了");

else

jl1.setText(" 数大了");

}

catch (NumberFormatException e) {

jf.setText("");

jl1.setText(" 请输入数字");

}

}

public void actionPerformed(ActionEvent e){ //实现按钮的事件

if(e.getSource()==jb1)

getNum();

else

if(e.getSource()==jb2)

test();

}

public static void main(String[] agrs){

new Sample();

}

}

JAVA编程,求大神啊,感激不尽!

代码如下:

import java.util.Scanner;

public class App33 {

public static void main(String[] args) {

Scanner scanner = new Scanner(System.in);

int[] numbers = new int[8];

for (int i = 0; i  numbers.length; i++) {

while ((numbers[i] = scanner.nextInt()) = 0) {

System.out.println("请输入一个正整数: ");

}

}

int sum = 0;

int max = Integer.MIN_VALUE;

int min = Integer.MAX_VALUE;

for (int i = 0; i  numbers.length; i++) { 

sum += numbers[i];

if (numbers[i]  max) {

max = numbers[i];

}

if (numbers[i]  min) {

min = numbers[i];

}

}

float average = sum * 1.0f / numbers.length;

System.out.println("总和:" + sum);

System.out.println("平均值:" + average);

System.out.println("最大值:" + max);

System.out.println("最小值:" + min);

}

}

java一个简单小程序,求高手帮忙编写,万分感谢

class Ball {

public void play() {

System.out.println("玩球儿...");

}

}

class Football extends Ball {

public void play() {

System.out.println("使用足球运动");

}

}

class Basketball extends Ball {

public void play() {

System.out.println("使用篮球运动");

}

}

public class TestMain {

public static void main(String[] args) {

TestMain tm = new TestMain();

tm.testPlay();

}

public void testPlay() {

Ball ball = new Football();

ball.play();

ball = new Basketball();

ball.play();

}

}

/*

D:\javac TestMain.java

D:\java TestMain

使用足球运动

使用篮球运动

*/

java程序,求高手指导

非法参数异常:将容器的父类添加到了自己:

jb.add(jb,""+i);

此行代码不对